CN214506641U - Dual-power switching circuit and power supply device - Google Patents
Dual-power switching circuit and power supply device Download PDFInfo
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- CN214506641U CN214506641U CN202023025327.4U CN202023025327U CN214506641U CN 214506641 U CN214506641 U CN 214506641U CN 202023025327 U CN202023025327 U CN 202023025327U CN 214506641 U CN214506641 U CN 214506641U
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Abstract
The application discloses a dual power supply switching circuit and a power supply device, wherein a first detection circuit outputs a first turn-off signal when a first input voltage output by an external power supply is input, a second detection circuit outputs a second turn-off signal when the first input voltage is input, a switch circuit stops switching a second input voltage output by a battery power supply to an electric load when the first turn-off signal and the second turn-off signal are input, and prevents the first input voltage from being output to the battery power supply, switches the second input voltage to the electric load when the first turn-off signal and the second turn-off signal are stopped, a backflow prevention circuit unidirectionally switches the first input voltage to the electric load and prevents the second input voltage from being output to the external power supply, so that the battery power supply is in a non-working state when the external power supply outputs the first input voltage, the service life of the battery power supply is prolonged, and when the external power supply stops outputting the first input voltage, the second input voltage is prevented from flowing backward to the external power supply.
Description
Technical Field
The application belongs to the technical field of battery charging, and particularly relates to a dual-power switching circuit and a power supply device.
Background
Traditional lithium battery power supply unit, when external power source inserts power supply unit, external power source's electric current need flow through the lithium cell again through lithium cell external discharge, this leads to the lithium cell to be used excessively, makes the life-span of lithium cell subtract the weak point.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a dual-power switching circuit, and aims to solve the problem that the service life of a battery is shortened because a traditional battery power supply device needs to discharge externally after the battery when being powered externally.
A first aspect of an embodiment of the present application provides a dual power supply switching circuit, including:
a first detection circuit configured to output a first off signal according to a first input voltage output from an external power supply when the first input voltage is input;
a second detection circuit configured to output a second off signal according to the first input voltage when the first input voltage is input;
a switching circuit, respectively connected to the first detection circuit and the second detection circuit, configured to stop switching a second input voltage output by a battery power supply to an electric load when the first off signal and the second off signal are input, and prevent the first input voltage from being output to the battery power supply, and to switch the second input voltage to the electric load when the first off signal and the second off signal are stopped from being input; and
and the backflow prevention circuit is respectively connected with the switch circuit and the external power supply, is configured to unidirectionally conduct the first input voltage to the power load, and prevents the second input voltage from being output to the external power supply.
In one embodiment, the switching circuit includes a first switching component and a second switching component;
a first switch assembly configured to prevent the first input voltage from being output to the battery power source when the first off signal is input, and to switch the second input voltage when the input of the first off signal is stopped;
a second switch assembly connected with the first switch assembly and configured to stop outputting the second input voltage to an electric load when the second turn-off signal is input, and to switch the second input voltage output by the first switch assembly to the electric load when the second turn-off signal is stopped being input.
In one embodiment, the first switch assembly comprises a first field effect transistor;
the grid electrode of the first field effect transistor is connected to a first turn-off signal input end of the first switch component, the drain electrode of the first field effect transistor is connected to a second input voltage input end of the first switch component, and the source electrode of the first field effect transistor is connected to a second input voltage output end of the first switch component.
In one embodiment, the second switch assembly includes a second fet;
the grid electrode of the second field effect transistor is connected to the second turn-off signal input end of the second switch component, the source electrode of the second field effect transistor is connected to the second input voltage input end of the second switch component, and the source electrode of the second field effect transistor is connected to the second input voltage output end of the second switch component.
In one embodiment, the first detection circuit includes a first resistor;
the first end of the first resistor is connected to the first input voltage input end of the first detection circuit and the first turn-off signal output end of the first detection circuit, and the second end of the first resistor is connected to a power ground.
In one embodiment, the second detection circuit includes a second resistor;
the first end of the second resistor is connected to the first input voltage input end of the second detection circuit and the second turn-off signal output end of the second detection circuit, and the second end of the second resistor is connected to a power ground.
In one embodiment, the backflow prevention circuit comprises a first diode;
the positive pole of the first diode is connected to the input end of the first input voltage of the anti-backflow circuit, and the negative pole of the first diode is connected to the output end of the first input voltage of the anti-backflow circuit.
A second aspect of embodiments of the present application provides a power supply apparatus including the dual power supply switching circuit according to any one of the first aspect.
In one embodiment, the power supply device further comprises the battery power supply;
the battery power supply is configured to output the second input voltage.
In one embodiment, the battery power source is a lithium battery.
Compared with the prior art, the embodiment of the utility model beneficial effect who exists is: the external power supply is detected by the first detection circuit and a first turn-off signal is output according to a first input voltage output by the external power supply, the second detection circuit detects the external power supply and a second turn-off signal is output according to the first input voltage, the switching circuit stops switching a second input voltage output by the battery power supply to the electric load when the first turn-off signal and the second turn-off signal are input and prevents the first input voltage from being output to the battery power supply, the second input voltage is switched to the electric load when the first turn-off signal and the second turn-off signal are not input, the backflow prevention circuit switches the first input voltage to the electric load and prevents the second input voltage from being output to the external power supply, therefore, when the external power supply outputs the first input voltage, the battery power supply is in a non-working state, the service time of the battery power supply is reduced, and the service life of the battery power supply is prolonged, when the external power supply stops outputting the first input voltage, the switch circuit switches the second input voltage output by the battery power supply to the power utilization load, and the backflow prevention circuit prevents the second input voltage from being output to the external power supply and prevents the second input voltage from flowing backwards to the external power supply.
Drawings
Fig. 1 is a schematic block diagram of a first example of a dual power switching circuit provided in an embodiment of the present application;
fig. 2 is a schematic block diagram of a second example of a dual power switching circuit provided in an embodiment of the present application;
fig. 3 is a schematic circuit diagram of an example of a dual power supply switching circuit provided in an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 shows a first exemplary schematic block diagram of a dual power supply switching circuit provided in an embodiment of the present application, and for convenience of description, only the parts related to the embodiment are shown, and detailed as follows:
the dual power switching circuit includes a first detection circuit 110, a second detection circuit 120, a switch circuit 130 and a backflow prevention circuit 140.
The first detection circuit 110 is configured to output a first off signal when a first input voltage output by the external power supply 310 is input.
The second detection circuit 120 is configured to output a second off signal according to the first input voltage when the first input voltage is input.
And a switching circuit 130 connected to the first detection circuit 110 and the second detection circuit 120, respectively, and configured to stop switching the second input voltage output from the battery power source 320 to the electric load 200 when the first off signal and the second off signal are input, prevent the first input voltage from being output to the battery power source 320, and switch the second input voltage to the electric load 200 when the first off signal and the second off signal are input.
The anti-backflow circuit 140 is respectively connected to the switching circuit 130 and the external power source 310, and is configured to conduct the first input voltage to the electrical load 200 in a single phase and prevent the second input voltage from being output to the external power source 310.
In this embodiment, when the external power source 310 outputs the first input voltage, the first detection circuit 110 and the second detection circuit 120 detect the first input voltage output by the external power source 310, the first detection circuit 110 and the second detection circuit 120 output the first off signal and the second off signal to the switch circuit 130 according to the first input voltage, respectively, the switch circuit 130 stops transferring the second input voltage output by the battery power source 320 to the electrical load 200 and prevents the first input voltage from being output to the battery power source 320 when the first off signal and the second off signal are input, at this time, the backflow prevention circuit 140 unidirectionally conducts the first input voltage to the electrical load 200 to supply power to the electrical load 200, so that when the external power source 310 outputs the first input voltage, the first input voltage does not charge the battery power source 320, the battery power source 320 does not discharge the electrical load 200, and the battery power source 320 is in an inoperative state, thus reducing the useful time of the battery power source 320 and thereby extending the useful life of the battery power source 320; when the external power source 310 stops outputting the first input voltage, the first detection circuit 110 and the second detection circuit 120 respectively stop outputting the first off signal and the second off signal to the switch circuit 130, the switch circuit 130 switches the second input voltage to the electric load 200, and the backflow prevention circuit 140 prevents the second input voltage from being output to the external power source 310, so as to prevent the second input voltage output by the battery power source 320 from flowing backward to the external power source 310.
Referring to fig. 2, in one embodiment, the switch circuit 130 includes a first switch element 131 and a second switch element 132.
The first switching element 131 is configured to prevent the first input voltage from being output to the battery power source 320 when the first off signal is input, and to switch the second input voltage when the input of the first off signal is stopped.
And a second switching element 132 connected to the first switching element 131 and configured to stop outputting the second input voltage to the electrical load 200 when the second off signal is input, and to transfer the second input voltage output by the first switching element 131 to the electrical load 200 when the second off signal is input.
In this embodiment, the first switch element 131 prevents the external power supply 310 from outputting the first input voltage to the battery power supply 320 when the first off signal is input, the second switch element 132 stops outputting the second input voltage to the power load 200 when the second off signal is input, so that the battery power supply 320 does not charge or discharge when the external power supply 310 outputs the first input voltage, the usage of the battery power supply 320 is reduced, and the service life of the battery power supply 320 is prolonged, the first switch element 131 switches the second input voltage to the second switch element 132 when the input of the first off signal is stopped, the second switch element 132 switches the second input voltage to the power load 200 when the input of the second off signal is stopped, and the power supply battery is used to supply power to the power load 200 when the external power supply 310 stops outputting the first input voltage.
Referring to fig. 3, in one embodiment, the first switch element 131 includes a first fet Q1;
the gate of the first fet Q1 is connected to the first off signal input terminal of the first switching element 131, the drain of the first fet Q1 is connected to the second input voltage input terminal of the first switching element 131, and the source of the first fet Q1 is connected to the second input voltage output terminal of the first switching element 131.
Referring to fig. 3, in one embodiment, the second switching element 132 includes a second fet Q2;
the gate of the second fet Q2 is connected to the second off signal input of the second switching element 132, the source of the second fet Q2 is connected to the second input voltage input of the second switching element 132, and the source of the second fet Q2 is connected to the second input voltage output of the second switching element 132.
Referring to fig. 3, in one embodiment, the first detection circuit 110 includes a first resistor R1;
a first terminal of the first resistor R1 is connected to the first input voltage input terminal of the first detection circuit 110 and the first off signal output terminal of the first detection circuit 110, and a second terminal of the first resistor R1 is connected to the power ground.
Referring to fig. 3, in one embodiment, the second detection circuit 120 includes a second resistor R2;
a first terminal of the second resistor R2 is connected to the first input voltage input terminal of the second detection circuit 120 and the second off signal output terminal of the second detection circuit 120, and a second terminal of the second resistor R2 is connected to the power ground.
Referring to fig. 3, in an embodiment, the backflow prevention circuit 140 includes a first diode D1;
the anode of the first diode D1 is connected to the input terminal of the first input voltage of the anti-backflow circuit 140, and the cathode of the first diode D1 is connected to the output terminal of the first input voltage of the anti-backflow circuit 140.
The dual power switching circuit shown in fig. 3 will be described with reference to the operation principle, when the external power source 310 outputs the first input voltage, the first input voltage is outputted to the electric load 200 through the first diode D1, the first input voltage acts on the first resistor R1 to generate a high level (first off signal), the first input voltage acts on the second resistor R2 to generate a high level (second off signal), the first off signal acts on the gate of the first fet Q1 to turn off the first fet Q1, the second off signal acts on the gate of the second fet Q2 to turn off the second fet Q2, and the cathode of the body diode of the first fet Q1 is connected to the cathode of the body diode of the second fet Q2, so that the first fet Q1 and the second fet Q2 completely isolate the first input voltage from the input voltage path of the first input battery and the output voltage path of the second fet Q86320 to the second fet Q2 when the first fet Q1 and the second fet Q2 are both off A passage of the consumer load 200; when the external power source 310 stops outputting the first input voltage, the gate of the first fet Q1 and the gate of the second fet Q2 are both at a low level, the first fet Q1 and the second fet Q2 are both turned on, the second input voltage output by the battery power source 320 is output to the electric load 200 through the first fet Q1 and the second fet Q2, and the second input voltage cannot be output to the external power source 310 through the first diode D1 under the reverse blocking action of the first diode D1.
The dual power switching circuit shown in fig. 3 has a simple circuit structure and uses a small number of electronic components, thereby simultaneously achieving the advantage of low production cost.
The embodiment of the present application further provides a power supply device, including the dual power switching circuit according to any of the above embodiments, because the power supply device of the present embodiment includes the dual power switching circuit according to any of the above embodiments, the power supply device of the present embodiment at least has the corresponding beneficial effects of the dual power switching circuit according to any of the above embodiments.
In one embodiment, the power supply device further includes a battery power source 320, and the battery power source 320 is configured to output the second input voltage.
In one embodiment, the battery power source 320 is a lithium battery, which has a wide application range, so that the application scenarios of this embodiment are more.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A dual power switching circuit, comprising:
a first detection circuit configured to output a first off signal according to a first input voltage output from an external power supply when the first input voltage is input;
a second detection circuit configured to output a second off signal according to the first input voltage when the first input voltage is input;
a switching circuit, respectively connected to the first detection circuit and the second detection circuit, configured to stop switching a second input voltage output by a battery power supply to an electric load when the first off signal and the second off signal are input, and prevent the first input voltage from being output to the battery power supply, and to switch the second input voltage to the electric load when the first off signal and the second off signal are stopped from being input; and
and the backflow prevention circuit is respectively connected with the switch circuit and the external power supply, is configured to unidirectionally conduct the first input voltage to the power load, and prevents the second input voltage from being output to the external power supply.
2. The dual power switching circuit of claim 1, wherein the switching circuit comprises a first switching component and a second switching component;
a first switch assembly configured to prevent the first input voltage from being output to the battery power source when the first off signal is input, and to switch the second input voltage when the input of the first off signal is stopped;
a second switch assembly connected with the first switch assembly and configured to stop outputting the second input voltage to an electric load when the second turn-off signal is input, and to switch the second input voltage output by the first switch assembly to the electric load when the second turn-off signal is stopped being input.
3. The dual-power-supply switching circuit of claim 2, wherein the first switching component comprises a first field-effect transistor;
the grid electrode of the first field effect transistor is connected to a first turn-off signal input end of the first switch component, the drain electrode of the first field effect transistor is connected to a second input voltage input end of the first switch component, and the source electrode of the first field effect transistor is connected to a second input voltage output end of the first switch component.
4. The dual power switching circuit of claim 2, wherein the second switching component comprises a second field effect transistor;
the grid electrode of the second field effect transistor is connected to the second turn-off signal input end of the second switch component, the source electrode of the second field effect transistor is connected to the second input voltage input end of the second switch component, and the source electrode of the second field effect transistor is connected to the second input voltage output end of the second switch component.
5. The dual-power-supply switching circuit of claim 1, wherein the first detection circuit comprises a first resistor;
the first end of the first resistor is connected to the first input voltage input end of the first detection circuit and the first turn-off signal output end of the first detection circuit, and the second end of the first resistor is connected to a power ground.
6. The dual power switching circuit of claim 1, wherein the second detection circuit comprises a second resistor;
the first end of the second resistor is connected to the first input voltage input end of the second detection circuit and the second turn-off signal output end of the second detection circuit, and the second end of the second resistor is connected to a power ground.
7. The dual power switching circuit of claim 1, wherein the back-flow prevention circuit comprises a first diode;
the positive pole of the first diode is connected to the input end of the first input voltage of the anti-backflow circuit, and the negative pole of the first diode is connected to the output end of the first input voltage of the anti-backflow circuit.
8. A power supply device characterized by comprising the dual power supply switching circuit according to any one of claims 1 to 7.
9. The power supply of claim 8 wherein said power supply further comprises said battery power source;
the battery power supply is configured to output the second input voltage.
10. The power supply of claim 9 wherein said battery power source is a lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023025327.4U CN214506641U (en) | 2020-12-15 | 2020-12-15 | Dual-power switching circuit and power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023025327.4U CN214506641U (en) | 2020-12-15 | 2020-12-15 | Dual-power switching circuit and power supply device |
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| Publication Number | Publication Date |
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| CN214506641U true CN214506641U (en) | 2021-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023025327.4U Active CN214506641U (en) | 2020-12-15 | 2020-12-15 | Dual-power switching circuit and power supply device |
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| CN (1) | CN214506641U (en) |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230104 Address after: 523000 Room 301, building 1, No. 9, industrial West Third Road, Songshanhu Park, Dongguan City, Guangdong Province Patentee after: Dongguan chuangzhimei Technology Co.,Ltd. Address before: No.9, Gongye Xisan Road, Songshanhu hi tech Industrial Development Zone, Dongguan City, Guangdong Province 523000 Patentee before: DONGGUAN CHUANGMING BATTERY TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right |